The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 12, 2022
Filed:
Apr. 10, 2019
Yazaki Energy System Corporation, Tokyo, JP;
Takuju Nakamura, Tokyo, JP;
YAZAKI ENERGY SYSTEM CORPORATION, Tokyo, JP;
Abstract
A ceiling illumination window is provided with a transparent prism, and a reflecting member provided on a second edge of the transparent prism. Further, the transparent prism is installed in such a way as to enable light incident thereon at an angle, relative to a normal line to first and second transparent plates, that is at least equal to a prescribed angle to be reflected at a third edge using a critical angle. In addition, when light is incident at an angle at least equal to the prescribed angle relative to the normal line, the transparent prism emits the light toward an indoor ceiling side using at least two types of optical path having different numbers of reflections, using reflection at least one of the transparent prism surface and the reflecting member, and when light is incident at an angle less than the prescribed angle, the transparent prism allows the light to be transmitted through the third edge.